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" Protocol violation" Error in java application

Hi,

Background of the issue:
We have an application developed in java(jdk1.5 and DB is oracle 10g). At some point of time our application is giving below error and terminating. I had searched in the internet and all forums says that "this could be the driver issue(Comparability between oracle JDBC driver and DB). To resolve this we need to upgrade or we need to replace some latest version of jar files". But if I restart my application, it started working fine. I am getting this error very rarely. If it is really an driver issue, then it should not work when I restart my application.

I would like to understand that, in which scenario it can happen, since it is not happening every time.